Muzzle attachment for guns



Dec. 14, 1937. 5. ca. GREEN I MUZZLE ATTACHMENT FOR GUNS Filed Oct. 29, 1936 Inventor HZM EM M LI Patented -ee. i4. 193'? i: iTED STATES PATENT. OFFICE MUZZLE ATTACHMENT roa GUNS I Samuel G. Green, Gray, Ga. Application October as, 1936, Serial No. 108.222. 1 Claim. (01. 89-14) Y J (Granted under the act of March 3, 1883, as" amended April 30,1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a muzzle attachment throughout its length to establish a condition of operation that is especially favorable for prolonged firing.

To these and other ends the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claim forming a part of this specification;

A practical embodiment of the inventionis illustrated in the accompanying drawing, wherein:

Fig. 1 is a longitudinal sectional view of the improved muzzle attachment applied to the jacket of a gun.

Fig. 2 is a view in tube. Fig. 3 is asectional view on the line 3 -3 of g. 1. Fig. 4 is a longitudinal sectional view showing the attachment applied to a gun barrel. I Referring to the drawing by characters ofreference there is shown the front portion of a machine gun comprisii a reclprocable gun barrel 5 whose muzzle is mounted in a bearing 6 threadedly attached to the front plate l of a water jacket 8. I g

-The bearing 6 projects from the jacket and side elevation of the inner threadedly carries a large cylindrical block 9 conduct heat away from the bearing and the.

mumle of the gun barrel and it has 'a reduced threaded outer end it for carrying the muzzle attachment. 7

The attachment isconveniently formed of two comprising a perforated inner tube It and an imperforate outer tube, It. Thelnner tube has a thickened base It whereby it is threadedly mounted on the end ll! of the block and whereby it threadedly receives the outer tube and holds it spaced from the inner tube to provide an annular expansion chamber I lopen at its front end.

The inner tube is adapted to provide a cylindrical expansion chamber 18 in its rear portion and a forwardly constricted recompression chamber It in its front portion which terminates in a cylindrical outlet 20. The rear chamber I8 is of short length and has a large diameter which is in excess of its length and which has a relation to the bore of the gun barrel of about four to one. The front chamber is approximately twice the length of the rear chamber and the outer wall ii of the front chamber-istapered to provide a large outlet 22 for the annular chamber ll.

The inner tube is provided with a plurality of rows of apertures 23 progressively decreasing in size from rear to front. When a. projectile is fired from the gun barrel the gases from the propellent powder charge and the unconsumed particles of the charge issue from the muzzle and enter the expansion chamber l8. At this point the gases rapidly expand and a portion thereof discharges at relatively low velocity through the larger apertures 23. The remainder of the gases and the unconsumed particles of powder continue forward into the recompression chamber l9 and are discharged at high velocity through the smaller apertures 23 and into the annular chamber 81. This laterally directed portion of the gases moves into the gas stream that entered the chamber I! through the larger apertures and since expansion in the chamberl I is more or less unrestricted, the intermingling gases set up a condition of eddies, and cross currents that tends to extinguish or suppress flame propagation. The gases issuing from the expansion chamber prevent back pressure and the lateral diversion of the gases from the recompression chamber prevents accumulation and ignition in front of the outlet 20. This arrangement is especially favorable for prolonged firing as the attachment is uniformly heated throughout its length to a desired temperature of 900 to 950 degrees. v

In Fig. 4 the inner tube 24 and outertube 25 arethreadedly connected to an adapter 26 which in turn is threadedly connected to a gun barrel 21. The adapter is formed to provide an expansion chamber 28 flaring'from a point directly in front of the barrel and merging with the cylindrical expansion chamber The arrangement and structure of the inner and outer tubes, is similar to that of Fig. 1.

I claim; chamber of a diameter approximately four times In combination, a gun barrel, an attachment at the caliber of the gun barrel and havi at its the muzzle of the barrel comprising an imperfofront a tapered recompression' h m ppr x rate outer tube, an inner tube connected at its mately twice the length of the rear expansion 5 rear end to the outer tube and spaced therefrom chamber, and Said inner tube having a p a y of 5 to provide an annular expansion h b Said apertures decreasing in size from rear to front. inner tube having at its rear a. short expansion SAMUEL GR E 

